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A navigation satellite signal receiver and its cold start method

A technology for navigation satellites and receivers, which is applied in the field of satellite navigation and positioning, can solve the problem of long time consuming when a navigation satellite signal receiver is cold-started, and achieve the effects of improving speed, fast cold-starting, and saving time.

Inactive Publication Date: 2017-12-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The primary purpose of the present invention is to overcome the time-consuming defect of the existing navigation satellite signal receiver cold start, and to provide a fast cold start method of the navigation satellite signal receiver

Method used

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  • A navigation satellite signal receiver and its cold start method
  • A navigation satellite signal receiver and its cold start method
  • A navigation satellite signal receiver and its cold start method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A cold start method of a navigation satellite signal receiver, said method comprising the following steps:

[0047] S1: Receive the navigation message data of multiple satellites and perform bit synchronization on them, and store the navigation message data after bit synchronization;

[0048] S2: Perform frame synchronization on the navigation message data, and obtain the TOW and subframe number of the current subframe after the frame synchronization is completed;

[0049] S3: Determine the subframe number of the previous subframe according to the current subframe number. If the subframe number of the previous subframe is 1, 2 or 3, perform a reverse search on the navigation message data of the previous subframe to obtain part of the satellite data. ephemeris data and store it in the ephemeris storage area;

[0050] S4: continue to receive the navigation message data, and store the ephemeris data in the navigation message data in the ephemeris storage area, after obtai...

Embodiment 2

[0062] Such as figure 1 Shown, a kind of navigation satellite signal receiver, described navigation satellite signal receiver comprises:

[0063] Receiving channel: the number of receiving channels is multiple, and each receiving channel is used to receive the navigation message data of different navigation satellites, and perform bit synchronization and frame synchronization on the navigation message data. After the frame synchronization is completed, the TOW of the current subframe is obtained. and subframe number;

[0064] Data processing unit: used to determine the subframe number of the previous subframe according to the current subframe number, if the subframe number of the previous subframe is 1, 2 or 3, perform a reverse search on the data of the previous subframe to obtain Part of the ephemeris data is stored in the ephemeris storage area, and the ephemeris data in the subsequent received navigation message data is stored in the ephemeris storage area until the compl...

Embodiment 3

[0076] This embodiment combines the cold start method of embodiment 1 and the navigation satellite signal receiver of embodiment 2 to provide an implementation scheme of fast cold start of the navigation satellite signal receiver.

[0077] In the specific implementation process, such as figure 2 As shown, after the receiver is powered on, first check the validity of the internal local clock. If the local clock is valid, then read the effective time limit of the ephemeris stored in the receiver and compare it with the local clock. If the ephemeris stored in the receiver is within Within the valid time limit, enter the hot start mode; if the ephemeris stored in the receiver exceeds the valid time limit, read the valid time limit of the ephemeris stored in the receiver and compare it with the local clock, and if the local almanac is within the valid time limit, enter the warm start mode mode; if the time of the local clock of the receiver is invalid, or the ephemeris and almanac...

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Abstract

A navigation satellite signal receiver and a cold start method therefor. The method comprises: receiving navigation message data of a plurality of satellites, performing bit synchronisation on the navigation message data, and storing the bit-synchronised navigation message data; performing frame synchronisation on the navigation message data, and after finishing frame synchronisation, acquiring a TOW and sub-frame number of a current sub-frame; determining a sub-frame number of a previous sub-frame according to the current sub-frame number, if the sub-frame number of the previous sub-frame is 1, 2 or 3, reversely searching navigation message data of the previous sub-frame to obtain partial ephemeris data, and storing same into an ephemeris storage area; continuously receiving the navigation message data, storing ephemeris data in the navigation message data into the ephemeris storage area, after obtaining complete ephemeris data of a first sub-frame, a second sub-frame and a third sub-frame, decoding the ephemeris data, and acquiring all ephemeris parameters; and after acquiring ephemeris parameters of a pre-set number of satellites, starting to perform positioning. The method achieves quick cold start of a navigation satellite signal receiver.

Description

technical field [0001] The invention relates to the field of satellite navigation and positioning, and more specifically, to a navigation satellite signal receiver and a cold start method thereof. Background technique [0002] Global Navigation Satellite System (GNSS) is a satellite-based radio navigation system. The satellite continuously sends its own ephemeris parameters and time information. After receiving the information, the user calculates the three-dimensional position, three-dimensional direction, movement speed and time information of the receiver. [0003] Taking the Global Positioning System (GPS) as an example, the space segment uses 24 satellites at an altitude of about 20,200 kilometers to form a satellite constellation. The 21+3 satellites are all in near-circular orbits, with a running period of about 11 hours and 58 minutes, distributed on six orbital planes (four satellites per orbital plane), and an orbital inclination of 55 degrees. The distribution o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/13G01S19/27
CPCG01S19/27
Inventor 王峰钱瑞琦杨永达曹鼎钟鉴荣魏东明黎博渊袁林邹俊成刘浩成陈樱婷朱海波
Owner GUANGDONG UNIV OF TECH
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